fsync —
"synchronize a file's in-core state with that on disk"
SYNOPSIS
#include <unistd.h> intfsync(int fd);
DESCRIPTION
fsync();
causes all modified data and attributes of
fd
to be moved to a permanent storage device.
This normally results in all in-core modified copies
of buffers for the associated file to be written to a disk.
fsync();
should be used by programs that require a file to be in a known state,
for example, in building a simple transaction facility.
RETURN VALUES
A 0 value is returned on success.
A \-1 value indicates an error.
ERRORS
The
fsync();
fails if:
[EBADF]
fd
is not a valid descriptor.
[EINVAL]
fd
refers to a socket, not to a file.
[EIO]
An I/O error occurred while reading from or writing to the file system.